UnusualParadox said:
I guess a more objective definition for big_breasts would be DD to E cup, but less than F. Small_breasts could also be defined as B cup or smaller, but not flatchested. Probably just deconstructed my argument, but I still think that using terms like "big" or "small" regarding male or female genitalia is a bit subjective, especially for how they're currently used.

How would you determine a character's cup size without knowing a character's overall size? For tagging purposes, all measurements have to be relative to something. My suggestion was comparing breast size to torso width which would produce less odd results.